Drilling and coring tool



- Feb 3, 193i. J. N. oKsi-:NHOLT ET AL Lgm DRILLING AND CORING TOOL IFiled Sept. 28, .1.926

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Patented Feb. 2a ila'l NETE@ STATES tratan PATENT @FFECJ .TENS N.OKSENHOLT AND JAMES A. COLEMAN, OF JENA, LOUISIANA.

DRILLNG AND CORING TOOL Application led September 28, 1926. Serial No.138,306.

'lhis invention relates to an improved drilling and coring tool.

The object of the invention is to provide a drilling and coring toolwhich will form .1; and retain a sample of the formation and which is soconstructed and organized that the core may be readily taken from thetool. Another object resides in the provision ot a device of thischaracter wherein provision is made for effective drilling and coringand for the circulation of water or other Huid during the drilling andcoring opera-tion.

Other objects and advantagesreside in cer tain novel features of theconstruction, ar- '..o' rangement and combination oparts which will behereinafter more fully described aud particularly pointed out in theappended claims, reference being had to the accompanying drawingsforming a part of this specification, and in which :d

Figure 1 is a view partly in side elevation and partly in sectionshowing the lower portion of a tool embodying the present invention,

Figure 1n is a similar view of the upper portion vofthe tool shown inFigure 1,

Figure 2 is a plan view of the lower end of the tool7 Figure 3 is a viewin transverse vertical section of the lower portion of the tool,

Figure 4 is a detail perspective view ot' one of the drilling cutters,

Figure 5 is a fragmentary sectional detail taken on the line 5 5 ofFigure 2, and

Figure 6 is a similar sectional detail taken on the line 6-6 o'fFigurc2.

eferring to the drawings it will beseen that the tool comprises a onepiece tubular body 1 having a plurality, preferably three,longitudinally extending and outwardly projecting ribs 2. At the lowerends of the body slots 3 are Jformed therein and in the ribs 2 and theseslots extend transversely of the body and are smaller attheir lower thanat 15 their upper ends, these slots tapering or gradually decreasing insize from their upper to their lower ends. In the slots 3 thecorrespondingly tapered attaching portions 4 'of the drilling cutters 5are mounted. The cutters 5 are held in position in the slots 3 by virtueof the tapered form of the slots and the corresponding tapered form ofthe attaching portions 4 of the cutters and by virtue of the securingaction of a cylindrical coring member 6, the cylindrical coring member 6having a reduced and externallythreaded upper end 7 threadedly engagedwith the tubular body 1 and abutting the inner ends of the attachingportions 4 of the cutters tohold the cutters 5 in position. The lowerend of the coring` member 6 is provided with cutting teeth 8.

The upper end of the tubular body 1 is provided with a reducedexternally threaded extension 10 thread'e'dly connected or otherwisesuitably secured to the lower face of the drill pipe 12.

The coring member 6 has its longitudinal opening 11 tapering graduallyfrom a small lower end of a large upper end and this formation of thecoring member tends to retain the core in the member and in the corebarrel 12 which the longitudinal bore of the tubular body 1 provides. Atthe upper end of the tubular body 1 a tubular core barrel eXtension 15is provided, the core barrel extension being of any suitable length butpreferably being of substantial length. rlhe lower end of this corebarrel 15 is threadedly connected with the upper end of the tubular bodyl and beyond its threaded connection with the tubular body 1 thisextension 15 is located within the drill stem. At its upper end theextension 15 is provided with a valve seat 1G with which a ball Valve 17co-acts. A cage 18 is provided for the bal'l valve. The ball valve 17controls the communication of the interior of the extension 15 with theinterior of the drill stem. As the extension 15 is smaller in diameterthan the drill stem a space 20 is provided between the outside of theextension 15 and the inside of the drill stem and through this space 2Othe circulating fluid is pumped. From the space 2O the fluid passesthrough longitudinal openings 21 formed in the stock or material of thetubular body 1. These openings 21 extend all the way down through thebody 1 and their lower ends discharge below the body and adjacentlongitudinally extending slots 22 formed at the fitti outer surface ofthe coring member 6 so that the circulating fluid not only coursesaround the cutters 5 but also travels down to and courses around thecutting teeth 8. rthe passage of the fluid through the slots 23decreases the resistance which the formation sets up to the rotation otthe coring meinber 6.

In operation the cutters 5 serve to carry out the drilling of the welland simultaneously with their operation the teeth S cut a core from theformation and the core so cut passes up through the coring nielnber (iand into the barrel l2. 'Ehe tap-ered formation ot the coring inember (itends to retain the core in position and this function is enhanced bythe section of the valve lli which permits displacement ot' iuid out otthe core barrel and which auton'iatically closes to prevent escape ofthe core.

lWe claim l. fla core bit comprising a tubular body, radially otlsetribs spaced about the outer side of said body, said ribs having slotsopening inwardly ot the saine and into the bore ot said body? cuttersdisposed beneath said ribs and having,` portions engaged in the saidslots, and a cylindrical core cutter seated in the lower end et the boreof said body and abutting the inner sides et the engaged portions ofsaid cutters to locl the latter in position.

2. t core bit comprising a tubular bodyi radially offset ribs at theouter side ot said body and having their lo Per ends disposedsubstantially in the plane et the lower end ot the latter, said ribshaying slots opening inwardly ot the saine and into the bore ot' saidbody, cutters disposed beneath said ribs and having reduced portions'formed there with to be engaged in the said slots a shoulder formed atthe outer side ot each ot said cutters and engageable with the lower endof the. coinplernental oi said ribs, and a cylindrical core cutterseated in the lower end of th-e bore ot said body and abutting the innersides of the engaged portions ot said cutters to lock the latter inposition.

3. A corel bit comprising a tubular body7 radially odset vertical ribsspaced circumterentially about the outer side of said body and havingtheir lower ends projecting slightly below the lower end et the latter,said ribs having slots opening outwardly ot the lower ends oic the sameand into said body., cutters disposed beneath said shoulders and havingportions engaged in the said slots, said slots being tapered in adownward direction for inter-locked engagement with the engaged portionsof said cutters9 and a cylindrical core cutter seated in the lower endot the bore of said body and abutting the inner sides of the engagedportions ot said cutters to lock the latter in position.

t. A core bit comprising a tubular body9 Merate radially odsetvertically elongated ribs spaced circumterentially about the outer sideof said body and having their lower ends projecting slightly below thelower end of the latter, said ribs having slots opening outwardly ot thelower ends ot' the same and into said body, cutters disposed beneathsaid shoulders and having portions engaged in the said slots, said slotsbeing tapered in a downward direction for interlockcd engagenient withthe engaged portions of said cutter, a cylindrical core cutter seated inthe lower end ot the bore of said body and abutting the inner sides otthe engaged portions of said cutters to lock the latter in position, andwater courses passing downwardly ot' said body in planes between thesaid ribs and adjacent the leading edges of said cutters.

JENS N. @lSElill-llfl. JAMES d. COREE/leiht.

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